can actually lead to problems with self-confidence and self-satisfaction. A nationally representative survey of American teens ages 13–17 by Common Sense Media found that 45% said getting "likes" on posts is at least somewhat important, and 26% at least somewhat agreed that they feel bad about themselves if nobody comments on or "likes" their photos. Some evidence suggests that perceived rejection may lead to feeling emotional pain, and some may partake in online retaliation such as online bullying. Conversely, according to research from UCLA, users' reward circuits in their brains are more active when their own photos are liked by more peers. Literature suggests that social media can breed a negative feedback loop of viewing and uploading photos, self-comparison, feelings of disappointment when perceived social success is not achieved, and disordered body perception. In fact, one study shows that the microblogging platform, Pinterest is directly associated with disordered dieting behavior, indicating that for those who frequently look at exercise or dieting "pins" there is a greater chance that they will engage in extreme weight-loss and dieting behavior. As a health behavior change and reinforcement tool Social media can also function as a supportive system for adolescents' health, because by using social media, adolescents are able to mobilize around health issues that they themselves deem relevant. For example, in a clinical study among adolescent patients undergoing treatment for obesity, the participants' expressed that through social media, they could find personalized weight-loss content as well as social support among other adolescents with obesity. Whilst, social media can provide such information there are a considerable amount of uninformed and incorrect sources which promote unhealthy and dangerous methods of weight loss. As stated by the national eating disorder association there is a high correlation between weight loss content and disorderly eating among women who have been influenced by this negative content. Therefore, there is a need for people to evaluate and identify reliable health information, competencies commonly known as health literacy. This has led to efforts by governments and public health organizations to use social media to interact with users, to limited success. Other social media, such as pro-anorexia sites, have been found in studies to cause significant risk of harm by reinforcing negative health-related behaviors through social networking, especially in adolescents. Social media effects the way a person views themselves. The constant comparison to edited photos, of other individual's and their living situations,